Tilley control cock washer 234 variations

Discussion in 'Fettling Forum' started by Andrew Simpson, Apr 27, 2021.

  1. Andrew Simpson United Kingdom

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    Most Tilley washers look pretty much the same whichever supplier they come from, though I know the material can vary. The one inside the gland nut for the control cock though comes in a round or square profile and various thicknesses. The picture shows 2 of the ones I have, another type from the trusty Fettlebox has a round profile but I haven't any spares so no photo. They seem to be interchangeable in any control cock I've got, but is there any advantage of one over another, and is it connected to the debate over why Tilley used to say it needed two?

    20210427_163318.jpg
     
  2. David Shouksmith

    David Shouksmith United Kingdom Founder Member

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    The round-section ones are actually just O-rings. The square-section ones have been cut from a sheet of rubber of some sort. As the cutter bit pierces the material, the rubber becomes compressed and deforms resulting in the curved sides. This effect is increased the thicker and softer the rubber sheet is, particularly when the diameter of the seals is small, hence my supposition that it was better to use two thinner washers in the gland seal than just one thicker one - the thinner washers were more likely to cut 'square' than the single thicker one.

    That simple explanation seems to fit in with my idea of how the world works and therefore suits me. It may not suit everyone, especially those who seem hell-bent on finding the most complicated explanation for the most trivial of things... :)
     
  3. AussiePete

    AussiePete Australia Subscriber

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    Ah David, Occam’s razor, and I do agree with your explanation.
    Cheers
    Pete
    @David Shouksmith
     
  4. David Shouksmith

    David Shouksmith United Kingdom Founder Member

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    Yes, in engineering terms it's bad practice to use two washers in the same place (which is why I tend to use only one) but I guess in this instance the benefits of doing so outweigh the disadvantages... :-k
     
  5. Tony Press

    Tony Press Australia Subscriber

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    David

    It was Bernie Holmes who told me he began using the two O-rings in the packing nut a long time ago. I reckon he’s fettled more Tilley’s than most of us.

    Cheers

    Tony
     
  6. Johnny19

    Johnny19 United Kingdom Subscriber

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    The X246B MK2 I have, works fine with one of the thick washers in the Gland nut. It was leaking with the 2 O ring type washers, and yet my other Tilleys of various types are OK with those! :-k
     
  7. David Shouksmith

    David Shouksmith United Kingdom Founder Member

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    I don't know of Bernie Holmes, Tony - is he a member here?

    I'm pretty sure that Tilley have always supplied two gland washers in the SP1 and 498 seals kits. Since they supply only one of all the other washers, my inference has been that they intended both of them were fitted inside the gland nut... :)
     
  8. Johnny19

    Johnny19 United Kingdom Subscriber

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    So....Where these used before the 2 gland washer system?

    s-l300.jpg
     
  9. Tony Press

    Tony Press Australia Subscriber

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    David

    Bernie Holmes worked with Jim Dick on the Tilley book. He’s from TW Sands in Melbourne.

    @Johnny19

    I’ve never seen Tilley gland nuts like that. Where did they come from?

    Edit: With that weird shape wow do they fit in the packing nut properly?

    Tony
     
  10. David Shouksmith

    David Shouksmith United Kingdom Founder Member

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    I very much doubt it - those look like aftermarket parts cut from thick, soft rubber sheet using a blunt punch. I've made them myself just like that, many times over. :oops:

    They do work OK, Tony and thanks for the information about Bernie... :thumbup:
     
  11. Pancholoco1911 United States

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    I use only o-rings for washers.
     
  12. David Shouksmith

    David Shouksmith United Kingdom Founder Member

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    O-rings wouldn't be suitable for applications where they're not positively located...
     
  13. Johnny19

    Johnny19 United Kingdom Subscriber

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  14. Henry Plews

    Henry Plews Subscriber

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    I don't think they did and this topic encouraged me to have another look at some other "collectibles". Note that two valve washers are depicted in each of the following variants

    In this unused (at least, not by me) washer pack, there is neither mention nor image of gland nut washer 234 yet one is included.

    Eng. (a).JPG
    Eng. (b).JPG

    This packet, 'PRINTED IN ENGLAND' does refer to two gland nut washers yet only shows one.

    Ire. 01(a).JPG

    Ire. 01(b).JPG
    This later packet (no reference as to where printed) refers to the gland nut washer in the singular.

    Ire. 02(a).JPG
    Ire. 02(b).JPG
     
  15. Tony Press

    Tony Press Australia Subscriber

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    @Henry Plews

    I’ll have to dig out some old Tilley kits and see what’s inside.

    Cheers

    Tony
     

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